When-X · Coach map · Not a prescription
When RBC magnesium is low, or symptoms plus a useless serum
Serum magnesium can look fine while tissue is not. The owner's rule is to read RBC magnesium. Cramps, poor sleep, or a GLP-1 / low-carb week do not replace the lab.
Read this first
- Coach, not doctor. Aaron Cuha is a coach, not a doctor. No medical credential is claimed for him, or for these pages. A number on a blood test is something to talk over with a doctor, not something to diagnose yourself with. Nothing here is a prescription, a plan to follow, or a reason to start or stop a medicine. Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.
- Knowledge stays free. Knowledge stays free. Every page, every guide and every tool is free to read and stays free. No partner paid for a place on these pages.
- Three kinds of lab page, kept apart. /bloodwork is blood tests for people. /testing and /prices/labs are lab tests on peptide vials. /supplements/quality is what is in the bottle.
What a coach checks first
Check eGFR first. Magnesium is not a casual bottle when the kidneys are not clearing it. Diuretics and some reflux medicines belong in the same conversation.
What this does not mean
It does not mean magnesium threonate is a brain drug. It does not mean glycinate is proven for sleep. The blood-pressure effect is about 2 mmHg in a 34-trial meta-analysis. Real and small.
Markers to ask for on the blood test order
Supplements worth asking about, not orders
What people typically order
Ask for RBC magnesium and a BMP with eGFR. Serum magnesium on the BMP is context. An 'electrolyte' powder is not a lab.
When to stop
Retest at about ninety days. If RBC magnesium did not move, stop the bottle or change the form with the clinician, and check whether the label was quoting elemental magnesium.